docs: def get_short_history(self, ticket_id):
          """ Get set of short history items
  
          :param ticket_id: ID of ticket
          :returns: List of history items ordered increasingly by time of event.
                    Each history item is a tuple containing (id, Description).
                    Returns None if ticket does not exist.
          """
          msg = self.__request('ticket/{}/history'.format(str(ticket_id), ))
          items = []
          lines = msg.split('\n')
          multiline_buffer = ""
          in_multiline = False
          if self.__get_status_code(lines[0]) == 200:
              if (len(lines) > 2) and self.RE_PATTERNS['does_not_exist_pattern'].match(lines[2]):
                  return None
              if len(lines) >= 4:
                  for line in lines[4:]:
                      if line == "":
                          if not in_multiline:
                              # start of multiline block
                              in_multiline = True
                          else:
                              # end of multiline block
                              line = multiline_buffer
                              multiline_buffer = ""
                              in_multiline = False
                      else:
                          if in_multiline:
                              multiline_buffer += line
                              line = ""
                      if ': ' in line:
                          hist_id, desc = line.split(': ', 1)
                          items.append((int(hist_id), desc))
          return items